Start with the bed, because everything else follows

A guest room is really a promise of a good night's sleep, and no amount of lavender sprigs will make up for a tired mattress. If your budget stretches to one significant purchase, make it a mattress that suits a range of bodies — a medium-firm pocket-sprung one, or a decent topper over what you already have. Add two pillows per guest, one soft and one firm, so nobody has to ask.

Bedding matters more in the country than in town, where heating tends to be easier to control. Pure cotton or linen breathes, and line-dried sheets carry a scent no fabric conditioner can imitate. In summer, use a 4.5 tog duvet with a cotton throw folded at the foot; in winter, a 10.5 tog and a wool blanket. Always make the bed up fresh on the day, and always leave a spare set in the wardrobe, because rural weather has a way of turning.

Light it as though the evening mattered

Nothing says "spare room" quite like a single overhead bulb. Banish it for the duration of your guests' stay and build light in layers instead: a bedside lamp with a warm-white bulb (2700K, and dimmable if possible), a low lamp on the chest of drawers, and a small nightlight or torch on the bedside table for the walk to the bathroom at three in the morning.

• Swap any cool, blue-white bulbs for warm ones — a 40-watt equivalent is plenty.
• Add lined or blackout curtains. Country mornings are bright in June, and a blackout blind behind a pretty curtain is the invisible kindness that lets guests lie in.
• Check every bulb, and keep a spare pair in the drawer.

Bring the countryside in — quietly

The trick with rural décor is to let the landscape do the talking rather than illustrate it. Think wool, linen, aged wood, rattan and stoneware — textures that echo the fields and hedgerows without resorting to cockerel-print cushions. A single sprig of rosemary in a small glass, a dried hydrangea head from the garden, or a jam jar of cow parsley in May will do more than a shelf of themed ornaments.

A woven basket of logs beside the fire, a wool rug over bare boards, and one or two framed photographs of the view from your own lane will root the room in its place. Keep the palette quiet — oatmeal, muted greens, soft chalky whites — and let a single colour in the throw or cushions carry the interest.

The small touches guests actually remember

Hospitality lives in the details that answer questions before they are asked. Set a tray on the dressing table with a kettle, a cafetière, a small selection of teas and a couple of biscuits or a slice of something home-baked. A carafe of water and two glasses beside the bed cost nothing and are always appreciated.

• A handwritten card with the Wi-Fi password, the time you'll be serving breakfast, and one or two local suggestions — a walk, a pub, a market day.
• A torch on the bedside table, a hot water bottle in winter, and a spare blanket that isn't hidden at the back of a cupboard.
• A small basket of things people forget: a toothbrush, cotton pads, painkillers, plasters, a sewing kit, a phone charger.
• Two or three books, ideally with local interest, and a current magazine. Not a shelf of cast-offs.

Warmth, quiet and comfort for every guest

Old rural houses have their own opinions about temperature. A radiator in a converted barn can take an hour to warm a room, and stone walls hold the cold long after the sun has gone. Check the heating schedule before your guests arrive, and if the room is slow to warm, add a small electric heater or an electric blanket on the bed — mentioning it in advance removes any awkwardness about using it.

Deal with draughts at the door and window, and put a thick rug where feet will land first. Noise travels differently in the country too: a cockerel at four, owls, a tractor at dawn. A pair of earplugs in the bedside drawer and a note explaining the dawn chorus turn a potential complaint into a story your guests will tell at home.

Make sure there is somewhere to put a suitcase — a folding luggage rack or a bench at the foot of the bed — plus a few hangers, an empty drawer, a mirror and hooks on the back of the door. If your guest is elderly or unsteady on their feet, put them near the bathroom and light the route with plug-in night lights.

Air, dust and finish the room properly

Days before arrival, air the room properly: open the windows wide, wash any linen that has been sitting in the cupboard since last summer, hoover under the bed and dust the top of the wardrobe. Country houses gather cobwebs faster than anyone expects, particularly in autumn when the spiders come in.

On the day itself, finish with fresh flowers, a lightly scented linen water on the pillows rather than a plug-in air freshener, and a final check that the lamps, the clock and the kettle all work. Then close the door and leave it alone. A welcoming guest room is not the one with the most in it — it is the one where everything has been considered, and nothing is left for your guests to sort out themselves.